Treatment of slag.



G. L. DANPOBTH, JR- v TREATMENT OF SLAG. APPLIGATION FILED AUG. 23, 1912.

1,071,605. Patented Aug. 26,1913;

Jaw/[fon- -and small shrinkage cracks arepnirnn STATES,

PATENT orrroa.

GEORGE L. DANFORTH, JR, OF CHICAGO, ILLINOIS.

TREATMENT OF SLAG.

Original application filed June 17, 191-1,

at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in the Treatment of Slag, of which the following is a specification.

My invention relates to the treatment of slag or cinder, and is especially, though not exclusively, adapted for use in connect-ion with handling and breaking up slag from open hearth or blast furnaces.

This application is a division of my copending application Serial No. 633,885, filed Jnne 17, 1911.

llerctotore it has been customary to pour the liquid slag formed in open hearth furnaces into a metal box or pot which is of such shape and size that the slag solidifies into a large, bulky lump, which must be broken up into small pieces suitable for ship ment. This large lump is ordinarily first chilled, and is then taken under a drop, where it is broken up, and the small ieces are then either hand-shoveled or loade by a grab bucket into cars preparatory to shipment. It will be apparent that there are disadvantages about this method: First, a. large equipment of metal boxes or pots is required; second, it is necessary to use transfer cars and other equipment in order to take the lumps of slag to the drop or other device by which it is broken up, and, third, the labor cost for handling the material in this way is higln In my improved method I provide a receptacle constructed of metal, this receptacle having a large plan area compared to the amount of slag which is to be poured into it at any one time, so that the liquid slag spreads'out and instead of forming a large lump which is difiicultto break up it forms a thin slab or sheet," neerably about six inches in thickness and of large exposed surface. I preferably apply water to this slab of slag so that the latter is -ra idly chilled dimmed. The receptacle is preferably hflsnch it will hold several slabs of slag, poured on top of the other. of successive slabs serves and disinte rate the slabs underneath'and which have een previously poured. Moreover, by using a large receptacle it is unone being depth that'- The addition. further to crack plurality of agitators specificationofnemrs n Patented Aug. 26,1913.

Serial No. 633,885. Divided and this application filed August 23. 1912. Serial No. 716,590.

necessary to empty it as frequently as would be the case were a small one employed. Contained within the receptacle I prefer to use agitators, by means of which the slag is thoroughly disintegrated and readily flows through a slot in the bottom of the receptacle intoi'a car which is set-beneath the platform on which thereceptacle is preferably placed; but the use ofsuch agitators forms no part of the method which I claim in this application.

By my improved method it will be clear to those skilled in the art that a great saving is efl ected in the preliminary cost of equipment, and that the operatin cost for labor is also greatly decreased. hese and other advantages of my inventionwill be more readily understood by reference to the accompanying drawings, which represent a preferred form of apparatus by'which my method may be carried out, and in which- Figure l is a side elevation partly broken away showing the slag flowing from the receptacle into a suitable car; Fig. 2 is a vertical cross-section throu h the receptacle showing severalla'yers 0 slag in position; and, Fig. 3 is a vertical cross-section through the slag-receiving receptacle, on the line 3 3 of Fig.1.

The slag-receiving receptacle 5 is preferably formed with a curved bottom, and is constructed of iron, steel or other suitable metal. Extending longitudinally along the bottom of the receptacle is a slot 6, the purpose of which will hereafter be apparent. In order to support the receptacle when it is placed on the ground or on a suitab e platform, the frame members 7 are attached to the receptacle by means of rivets or bolts members,-suitable bent plates may be used 'to inclose the bottomof the receptacle 5, if

such are preferred.

Attached to the receptacle 5 are 'the brackets 9, 9, each of which contains a pin 10 adapted to be engaged by'a hook 11 attached to a hoist of a crane. By means of the two brackets 9, 9, it will be evident that.

the receptacle 5 may easily be handled by a crane in much the same manner as an ordinary adle for containing molten steel.

Within the receptacle 5 I prefer to use a 12, each of which consists of a base 13, preferably triangular in cross-sectional area and. adapted to rest 8. In place of'using a plurality of frame within the receptacle 5 and cover the slot 6.

, Attached to the base 13 is the stem 14 terminating in the ring or eye 15 When all of the agitators 12 are placed in position, the slot 6 in the bottom of the receptacle 5 is covered throughout its entire length by the bases 13 of the agitators. I

My improved method of operation may now be readily understood. When a heat is tapped from an open hearth furnace the slag is-allowed to flow into the bottom of the receptacle 5, being prevented from flowing througluthe slot 6 by means of the bases 13 of the agitators 12, or by any other suitable means for closing the slot. The slag which is thus poured into the receptacle forms a layer 16 in the bottom of the latter.

t In order to cool the-slag quickly and cause the formation of shrinkage cracks, I preferably apply Water to the surface of the slag. When it is desired to pour additional slag into the receptacle, a second layer 17 is formed, which is preferably cooled in the manner just described. After this, successive layers 18, 19 and 20 may be added, or as many more as the capacity of the receptacle will allow. After the slag within thev receptacle 5 has become sufliciently cool to be readily handled, the receptacle is raised by means of a crane, the main hoists of which engage the pins 10,10 of the brackets 9, 9, and the receptacle is placed on a platform 21, being prevented from rocking by means of the frame members 7. The main hoists of the crane being removed from the pins 1O, 10, one of the auxiliary hoists may be attached to the'eye 15 of one of the agitators 12 (provided agitators are used), and

this agitator is then moved up and down, and the slag which is already filled with fine cracks is readily, broken up and flows through the slot 6 in the bottom of the receptacle 5 into the car 22, which is placed below the platform 21. All of the agitators 12 may be successively moved in the mannerv just described, and this Way all of the slag in a finely broken up condition is readily delivered into the car 22.

Instead of employing agitators within the receptacle 5 and allowing the slag to pass through the slot 6, I may deposit the various layers of slag as inst mentioned,

, and-then tipthe receptacle 5 so that, an of the slag contained in the receptacle is de- "livered to the car at once, The cooling action of the water applied to the surface of the layers, and also the subsequent heating I action of successively deposited layers, is such that the slag isbroken into comparatively small pieces even Without the use of the agitators. WVhen the agitators are not employed, the slot in the bottom of the receptacle 5 is, of course,-c1osed by suitable means. Instead of tipping the receptacle to deliver the slag therefrom, such closing means may be Withdrawn, and on shaking.

or otherwise agitating the receptacle as a whole, the finely cracked slag will readily pass from the receptacle through the slot 6. It will be apparent to those skilled in the art that many changes can be made in the exact method which I have described without departing from the spirit or scope of my invention. 'What I claim is:

The method of treating slag and the like, which consists in pouring a sufficient quan? tity of said slagin a liquid state into a receptacle of relatively large area to form a GEORGE, L. nauroarn. n.

Witnesses:

HENRY M. HUXLEY, LIE. HANNEN.

"epics of this'putent may be obtained for five cents each, by addressing the Commissioner of Eatentte' Waahington, D. G." 

